package com.sina.common.util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class DateUtil {

    /**
     * 计算两个日期之间相差的天数
     *
     * @param smdate 较小的时间
     * @param bdate  较大的时间
     * @return 相差天数
     * @throws ParseException
     */
    public static int daysBetween(Date smdate, Date bdate) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        smdate = sdf.parse(sdf.format(smdate));
        bdate = sdf.parse(sdf.format(bdate));
        Calendar cal = Calendar.getInstance();
        cal.setTime(smdate);
        long time1 = cal.getTimeInMillis();
        cal.setTime(bdate);
        long time2 = cal.getTimeInMillis();
        long between_days = (time2 - time1) / (1000 * 3600 * 24);

        return Integer.parseInt(String.valueOf(between_days));
    }

    public static int daysBetweenNowTo(long endTime) {
        return (int) Math.ceil((endTime - new Date().getTime()) / (1000 * 60 * 60 * 24));
    }

    /**
     * 字符串的日期格式的计算,例如2017-10-25
     */
    public static int daysBetween(String smdate, String bdate) {
        LogUtils.d("smdate = " + smdate + "bdate = " + bdate);
        long time1 = 0;
        long time2 = 0;
        try {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            Calendar cal = Calendar.getInstance();
            cal.setTime(sdf.parse(smdate));
            time1 = cal.getTimeInMillis();
            cal.setTime(sdf.parse(bdate));
            time2 = cal.getTimeInMillis();
        } catch (ParseException e) {
            e.printStackTrace();
        }
        long between_days = (time2 - time1) / (1000 * 3600 * 24);
        return Integer.parseInt(String.valueOf(between_days));
    }

    public static long milliSecondBetween(String smdate, String bdate) {
        LogUtils.d("smdate = " + smdate + "bdate = " + bdate);
        long time1 = 0;
        long time2 = 0;
        try {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            Calendar cal = Calendar.getInstance();
            cal.setTime(sdf.parse(smdate));
            time1 = cal.getTimeInMillis();
            cal.setTime(sdf.parse(bdate));
            time2 = cal.getTimeInMillis();
        } catch (ParseException e) {
            e.printStackTrace();
        }
        long betweenMilliSeconds = (time2 - time1);
        return betweenMilliSeconds;
    }

    public static String getCurrentDateString() {
        Date now = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//可以方便地修改日期格式
        return sdf.format(now);
    }
}
